Raycasting on a mesh collider

Unity Engine
1

hello,

I am trying to cast a raycast onto a custom 3D model using a mesh collider.
But the problem is the raycasting only works when the mesh collider is Convex.
and i really can’t use Convex.
Is there a solution for this?

Greetings.

2

A RayCast will hit a mesh collider regardless if it is convex or not, as long as it is not set to isTrigger = true.
Anyway, if it is indeed a trigger then you have to use a compound collider (multiple convex colliders on the same gameObject).

3

That’s what i thought too, but somehow it really won’t hit.

This is the raycast script:

    void StayOnGround ()
    {
         int layerMask = 1 << 8;
         RaycastHit hit;
         if (Physics.Raycast(transform.position, -Vector2.up, out hit, Mathf.Infinity, layerMask))
         {
            transform.position = new Vector3(transform.position.x, hit.point.y, transform.position.z);
         }
    }

And the screenshot of the scene:
http://imgur.com/1b9v1sU

I really don’t know why it won’t work.
But setting it to convex works, so that is odd.

4

non convex colliders are pretty expensive and not too reliable just use multple convex ones

5

It could be a problem with flipped normals, as well.